new: 映射vma

This commit is contained in:
fslongjin 2022-08-11 22:15:53 +08:00
parent 8d39334e39
commit 51bc465a25
9 changed files with 326 additions and 88 deletions

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@ -78,7 +78,7 @@ ul round(double x)
* @param _align
* @return ul
*/
ul ALIGN(const ul addr, const ul _align)
static __always_inline ul ALIGN(const ul addr, const ul _align)
{
return (ul)((addr + _align - 1) & (~(_align - 1)));
}

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@ -2,7 +2,7 @@
CFLAGS += -I .
all:mm.o slab.o mm-stat.o vma.o mmap.o
all:mm.o slab.o mm-stat.o vma.o mmap.o utils.o
mm.o: mm.c
gcc $(CFLAGS) -c mm.c -o mm.o
@ -18,3 +18,6 @@ vma.o: vma.c
mmap.o: mmap.c
gcc $(CFLAGS) -c mmap.c -o mmap.o
utils.o: utils.c
gcc $(CFLAGS) -c utils.c -o utils.o

29
kernel/mm/internal.h Normal file
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@ -0,0 +1,29 @@
#pragma once
#include "mm.h"
/**
* @brief vma结构体插入mm_struct的链表之中
*
* @param mm
* @param vma VMA结构体
* @param prev
*/
void __vma_link_list(struct mm_struct * mm, struct vm_area_struct * vma, struct vm_area_struct * prev);
/**
* @brief vma给定结构体从vma链表的结点之中删除
*
* @param mm
* @param vma VMA结构体
*/
void __vma_unlink_list(struct mm_struct * mm, struct vm_area_struct * vma);
/**
* @brief
*
* @param mm
* @param vaddr
* @return uint64_t
*/
uint64_t __mm_get_paddr(struct mm_struct * mm, uint64_t vaddr);

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@ -2,6 +2,7 @@
#include <common/glib.h>
struct mm_struct;
typedef uint64_t vm_flags_t;
/**
* @brief
@ -33,13 +34,13 @@ typedef struct
*/
struct vm_area_struct
{
struct List list; // 循环链表结构体
struct vm_area_struct *vm_prev, *vm_next;
// 虚拟内存区域的范围是一个左闭右开的区间:[vm_start, vm_end)
uint64_t vm_start; // 区域的起始地址
uint64_t vm_end; // 区域的结束地址
struct mm_struct *vm_mm; // 虚拟内存区域对应的mm结构体
uint64_t vm_flags; // 虚拟内存区域的标志位, 具体可选值请见mm.h
vm_flags_t vm_flags; // 虚拟内存区域的标志位, 具体可选值请见mm.h
struct vm_operations_t *vm_ops; // 操作方法
uint64_t ref_count; // 引用计数

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@ -110,7 +110,6 @@ void mm_init()
// 初始化bitmap 先将整个bmp空间全部置位。稍后再将可用物理内存页复位。
memset(memory_management_struct.bmp, 0xff, memory_management_struct.bmp_len);
io_mfence();
kdebug("1212112");
// 初始化内存页结构
// 将页结构映射于bmp之后
memory_management_struct.pages_struct = (struct Page *)(((unsigned long)memory_management_struct.bmp + memory_management_struct.bmp_len + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
@ -120,7 +119,6 @@ void mm_init()
// 将pages_struct全部清空以备后续初始化
memset(memory_management_struct.pages_struct, 0x00, memory_management_struct.pages_struct_len); // init pages memory
kdebug("ffff");
io_mfence();
// 初始化内存区域
memory_management_struct.zones_struct = (struct Zone *)(((ul)memory_management_struct.pages_struct + memory_management_struct.pages_struct_len + PAGE_4K_SIZE - 1) & PAGE_4K_MASK);
@ -618,65 +616,3 @@ uint64_t mm_do_brk(uint64_t old_brk_end_addr, int64_t offset)
return end_addr;
}
/**
* @brief
*
* @param page_table_phys_addr
* @param virt_addr
* @return true
* @return false
*/
bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr)
{
ul *tmp;
tmp = phys_2_virt((ul *)((ul)page_table_phys_addr & (~0xfffUL)) + ((virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
// pml4页表项为0
if (*tmp == 0)
return 0;
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
// pdpt页表项为0
if (*tmp == 0)
return 0;
// 读取pdt页表项
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_2M_SHIFT) & 0x1ff)));
// pde页表项为0
if (*tmp == 0)
return 0;
if (*tmp & (1 << 7))
{
// 当前为2M物理页
return true;
}
else
{
// 存在4级页表
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_4K_SHIFT) & 0x1ff)));
if (*tmp != 0)
return true;
else
return false;
}
}
/**
* @brief 2M页()
*
* @param paddr
* @return int8_t -> 1
* -> 0
*/
int8_t mm_is_2M_page(uint64_t paddr)
{
if (likely((paddr >> PAGE_2M_SHIFT) < mm_total_2M_pages))
return 1;
else
return 0;
}
// #pragma GCC pop_options

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@ -381,6 +381,7 @@ ul set_page_attr(struct Page *page, ul flags);
#define VM_IO (1 << 4) // MMIO的内存区域
#define VM_SOFTDIRTY (1 << 5)
#define VM_MAYSHARE (1 << 6) // 该vma可被共享
#define VM_USER (1 << 7) // 该vma可被用户态访问
/* VMA basic access permission flags */
#define VM_ACCESS_FLAGS (VM_READ | VM_WRITE | VM_EXEC)
@ -396,7 +397,6 @@ static inline void vma_init(struct vm_area_struct *vma, struct mm_struct *mm)
memset(vma, 0, sizeof(struct vm_area_struct));
vma->vm_mm = mm;
vma->vm_ops = NULL;
list_init(&vma->list);
}
/**
@ -422,15 +422,15 @@ static inline bool vma_is_accessible(struct vm_area_struct *vma)
/**
* @brief vma结构体mm进行绑定
*
*
* @param mm VMA绑定的内存空间分布结构体
* @return struct vm_area_struct* VMA
*/
struct vm_area_struct * vm_area_alloc(struct mm_struct *mm);
struct vm_area_struct *vm_area_alloc(struct mm_struct *mm);
/**
* @brief vma结构体
*
*
* @param vma vma结构体
*/
void vm_area_free(struct vm_area_struct *vma);
@ -489,14 +489,29 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
})
/**
* @brief
* @brief VMA
*
* @param page_table_phys_addr
* @param virt_addr
* @return true
* @return false
* @param mm
* @param vaddr
* @param length
* @param paddr
* @param vm_flags vma的标志
* @param vm_ops vma的操作接口
* @return int
*/
bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr);
int mm_map_vma(struct mm_struct *mm, uint64_t vaddr, uint64_t length, uint64_t paddr, vm_flags_t vm_flags, struct vm_operations_t *vm_ops);
/**
* @brief vma的映射
*
* @param mm mm
* @param vma vma
* @param paddr
* @return int
*/
int mm_umap_vma(struct mm_struct *mm, struct vm_area_struct * vma, uint64_t *paddr);
/**
* @brief 2M页()

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@ -1,5 +1,6 @@
#include "mm.h"
#include "slab.h"
#include "internal.h"
#include <common/compiler.h>
extern uint64_t mm_total_2M_pages;
@ -72,10 +73,16 @@ int mm_map_proc_page_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_s
// 计算线性地址对应的pml4页表项的地址
mm_pgt_entry_num_t pgt_num;
mm_calculate_entry_num(length, &pgt_num);
// kdebug("ent1=%d ent2=%d ent3=%d, ent4=%d", pgt_num.num_PML4E, pgt_num.num_PDPTE, pgt_num.num_PDE, pgt_num.num_PTE);
// 已映射的内存大小
uint64_t length_mapped = 0;
// 对user标志位进行校正
if (flags & PAGE_U_S)
user = true;
else
user = false;
uint64_t pml4e_id = ((virt_addr_start >> PAGE_GDT_SHIFT) & 0x1ff);
uint64_t *pml4_ptr;
if (is_phys)
@ -192,7 +199,6 @@ failed:;
return -EFAULT;
}
/**
* @brief
*
@ -262,7 +268,7 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
ul *pde_ptr = pd_ptr + pde_id;
// 存在4级页表
if (unlikely(((*pde_ptr) & (1 << 7)) == 0))
if (((*pde_ptr) & (1 << 7)) == 0)
{
// 存在4K页
uint64_t pte_id = (((virt_addr_start + length_unmapped) >> PAGE_4K_SHIFT) & 0x1ff);
@ -291,7 +297,7 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
// 3级页表已经空了释放页表
if (unlikely(mm_check_page_table(pd_ptr)) == 0)
kfree(pd_ptr);
kfree(pd_ptr);
}
// 2级页表已经空了释放页表
if (unlikely(mm_check_page_table(pdpt_ptr)) == 0)
@ -299,3 +305,93 @@ void mm_unmap_proc_table(ul proc_page_table_addr, bool is_phys, ul virt_addr_sta
}
flush_tlb();
}
/**
* @brief VMA
*
* @param mm
* @param vaddr
* @param length
* @param paddr
* @param vm_flags vma的标志
* @param vm_ops vma的操作接口
* @return int
*/
int mm_map_vma(struct mm_struct *mm, uint64_t vaddr, uint64_t length, uint64_t paddr, vm_flags_t vm_flags, struct vm_operations_t *vm_ops)
{
int retval = 0;
struct vm_area_struct *vma = vm_area_alloc(mm);
if (unlikely(vma == NULL))
return -ENOMEM;
vma->vm_ops = vm_ops;
vma->vm_flags = vm_flags;
vma->vm_start = vaddr;
vma->vm_end = vaddr + length;
// 将VMA加入链表
__vma_link_list(mm, vma, mm->vmas);
uint64_t len_4k = length % PAGE_2M_SIZE;
uint64_t len_2m = length - len_4k;
// ==== 将地址映射到页表
/*
todo:
*/
// 先映射2M页
if (likely(len_2m > 0))
{
uint64_t page_flags = 0;
if (vm_flags & VM_USER)
page_flags = PAGE_USER_PAGE;
else
page_flags = PAGE_KERNEL_PAGE;
// 这里直接设置user标志位为false因为该函数内部会对其进行自动校正
retval = mm_map_proc_page_table((uint64_t)mm->pgd, true, vaddr, paddr, len_2m, page_flags, false, false, false);
if (unlikely(retval != 0))
goto failed;
}
if (likely(len_4k > 0))
{
len_4k = ALIGN(len_4k, PAGE_4K_SIZE);
uint64_t page_flags = 0;
if (vm_flags & VM_USER)
page_flags = PAGE_USER_4K_PAGE;
else
page_flags = PAGE_KERNEL_4K_PAGE;
// 这里直接设置user标志位为false因为该函数内部会对其进行自动校正
retval = mm_map_proc_page_table((uint64_t)mm->pgd, true, vaddr + len_2m, paddr + len_2m, len_4k, page_flags, false, false, true);
if (unlikely(retval != 0))
goto failed;
}
flush_tlb();
return 0;
failed:;
__vma_unlink_list(mm, vma);
vm_area_free(vma);
return retval;
}
/**
* @brief vma的映射
*
* @param mm mm
* @param vma vma
* @param paddr
* @return int
*/
int mm_umap_vma(struct mm_struct *mm, struct vm_area_struct *vma, uint64_t *paddr)
{
// 确保vma对应的mm与指定的mm相一致
if (unlikely(vma->vm_mm != mm))
return -EINVAL;
if (paddr != NULL)
*paddr = __mm_get_paddr(mm, vma->vm_start);
mm_unmap_proc_table((uint64_t)mm->pgd, true, vma->vm_start, vma->vm_end - vma->vm_start);
return 0;
}

109
kernel/mm/utils.c Normal file
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@ -0,0 +1,109 @@
#include "internal.h"
extern uint64_t mm_total_2M_pages;
/**
* @brief
*
* @param mm
* @param vaddr
* @return uint64_t
*/
uint64_t __mm_get_paddr(struct mm_struct *mm, uint64_t vaddr)
{
ul *tmp;
tmp = phys_2_virt((ul *)(((ul)mm->pgd) & (~0xfffUL)) + ((vaddr >> PAGE_GDT_SHIFT) & 0x1ff));
// pml4页表项为0
if (*tmp == 0)
return 0;
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((vaddr >> PAGE_1G_SHIFT) & 0x1ff));
// pdpt页表项为0
if (*tmp == 0)
return 0;
// 读取pdt页表项
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(vaddr) >> PAGE_2M_SHIFT) & 0x1ff)));
// pde页表项为0
if (*tmp == 0)
return 0;
if (*tmp & (1 << 7))
{
// 当前为2M物理页
return (*tmp) & (~0x1fffUL);
}
else
{
// 存在4级页表
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(vaddr) >> PAGE_4K_SHIFT) & 0x1ff)));
return (*tmp) & (~0x1ffUL);
}
}
/**
* @brief
*
* @param page_table_phys_addr
* @param virt_addr
* @return true
* @return false
*/
bool mm_check_mapped(ul page_table_phys_addr, uint64_t virt_addr)
{
ul *tmp;
tmp = phys_2_virt((ul *)((ul)page_table_phys_addr & (~0xfffUL)) + ((virt_addr >> PAGE_GDT_SHIFT) & 0x1ff));
// pml4页表项为0
if (*tmp == 0)
return 0;
tmp = phys_2_virt((ul *)(*tmp & (~0xfffUL)) + ((virt_addr >> PAGE_1G_SHIFT) & 0x1ff));
// pdpt页表项为0
if (*tmp == 0)
return 0;
// 读取pdt页表项
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_2M_SHIFT) & 0x1ff)));
// pde页表项为0
if (*tmp == 0)
return 0;
if (*tmp & (1 << 7))
{
// 当前为2M物理页
return true;
}
else
{
// 存在4级页表
tmp = phys_2_virt(((ul *)(*tmp & (~0xfffUL)) + (((ul)(virt_addr) >> PAGE_4K_SHIFT) & 0x1ff)));
if (*tmp != 0)
return true;
else
return false;
}
}
/**
* @brief 2M页()
*
* @param paddr
* @return int8_t -> 1
* -> 0
*/
int8_t mm_is_2M_page(uint64_t paddr)
{
if (likely((paddr >> PAGE_2M_SHIFT) < mm_total_2M_pages))
return 1;
else
return 0;
}

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@ -1,28 +1,77 @@
#include "mm.h"
#include "slab.h"
#include "internal.h"
/**
* @brief vma结构体mm进行绑定
*
*
* @param mm VMA绑定的内存空间分布结构体
* @return struct vm_area_struct* VMA
*/
struct vm_area_struct * vm_area_alloc(struct mm_struct *mm)
struct vm_area_struct *vm_area_alloc(struct mm_struct *mm)
{
struct vm_area_struct * vma = (struct vm_area_struct *)kmalloc(sizeof(struct vm_area_struct),0);
if(vma)
struct vm_area_struct *vma = (struct vm_area_struct *)kmalloc(sizeof(struct vm_area_struct), 0);
if (vma)
vma_init(vma, mm);
return vma;
}
/**
* @brief vma结构体
*
*
* @param vma vma结构体
*/
void vm_area_free(struct vm_area_struct *vma)
{
if(list_empty(&vma->list)) // 如果当前是剩余的最后一个vma
if (vma->vm_prev == NULL && vma->vm_next == NULL) // 如果当前是剩余的最后一个vma
vma->vm_mm->vmas = NULL;
kfree(vma);
}
/**
* @brief vma结构体插入mm_struct的链表之中
*
* @param mm
* @param vma VMA结构体
* @param prev
*/
void __vma_link_list(struct mm_struct *mm, struct vm_area_struct *vma, struct vm_area_struct *prev)
{
struct vm_area_struct *next = NULL;
vma->vm_prev = prev;
if (prev) // 若指定了前一个结点,则直接连接
{
next = prev->vm_next;
prev->vm_next = vma;
}
else // 否则将vma直接插入到给定的mm的vma链表之中
{
next = mm->vmas;
mm->vmas = vma;
}
vma->vm_next = next;
if (next != NULL)
next->vm_prev = vma;
}
/**
* @brief vma给定结构体从vma链表的结点之中删除
*
* @param mm
* @param vma VMA结构体
*/
void __vma_unlink_list(struct mm_struct *mm, struct vm_area_struct *vma)
{
struct vm_area_struct *prev, *next;
next = vma->vm_next;
prev = vma->vm_prev;
if (prev)
prev->vm_next = next;
else // 当前vma是链表中的第一个vma
mm->vmas = next;
if (next)
next->vm_prev = prev;
}